基于索力模型修正的斜拉桥主梁损伤识别与验证
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摘要
为了快速检测斜拉桥主梁损伤,提出了一种基于索力模型修正的识别方法.首先建立了桥梁有限元模型并进行模型验证,形成优选原则以确定重点关注节段,将其单元刚度变化作为损伤识别参数修正变量,并将运营阶段实测索力作为跟踪目标.通过不断更新主梁不同节段局部刚度折减系数的取值进行模型修正,直至模型中的索力数值与实测索力值一致,此时的局部刚度折减系数取值与区域代表了主梁的刚度退化程度与所在位置.以蚌埠淮河大桥为例,利用荷载试验原始数据得到该桥成桥初态,以主梁节段接缝处局部刚度作为识别对象,以运营阶段实测索力作为跟踪目标,利用所提方法对主梁刚度退化的程度与位置进行识别,并基于桥检实测数据与结论验证该识别结果的准确性.分析结果表明,该方法具有科学合理与便捷经济的特点,适用于斜拉桥主梁运营状态的快速诊断与异变检测,可融入常规桥梁检测项目中.
For a quick damage detection of cable-stayed bridge girders, a cable force-based model updating method was proposed. First, a finite element(FE) bridge model was established and validated. The updated segments were selected by a selective preference principle and the segmental stiffness change was regarded as the updating variable during the damage detection. The measured cable forces during the bridge operation were regarded as the tracing target for the model updating. Then, the stiffness of selected segments was updated by setting different values of the stiffness reduction coefficient until the cable forces in the FE model were the same with the measured values. The values and the positions of these stiffness reduction coefficients represented the levels and locations of the damages in the main girder, respectively. The Bengbu Huaihe bridge was selected as a case study. The design condition of this bridge was determined by the original data from the loading test before bridge opening. The local stiffness of segment joints and the measured cable forces during the operation were regarded as the identification variable and tracing target, respectively. The identification results based on the proposed method were verified by the measurement data and the assessment conclusion in the bridge inspection reports. The analysis results show that the proposed method is logical and economic. It is suitable for quick assessment and change detection for cable-stayed bridges and can be integrated into routine projects of bridge inspection.
For a quick damage detection of cable-stayed bridge girders, a cable force-based model updating method was proposed. First, a finite element(FE) bridge model was established and validated. The updated segments were selected by a selective preference principle and the segmental stiffness change was regarded as the updating variable during the damage detection. The measured cable forces during the bridge operation were regarded as the tracing target for the model updating. Then, the stiffness of selected segments was updated by setting different values of the stiffness reduction coefficient until the cable forces in the FE model were the same with the measured values. The values and the positions of these stiffness reduction coefficients represented the levels and locations of the damages in the main girder, respectively. The Bengbu Huaihe bridge was selected as a case study. The design condition of this bridge was determined by the original data from the loading test before bridge opening. The local stiffness of segment joints and the measured cable forces during the operation were regarded as the identification variable and tracing target, respectively. The identification results based on the proposed method were verified by the measurement data and the assessment conclusion in the bridge inspection reports. The analysis results show that the proposed method is logical and economic. It is suitable for quick assessment and change detection for cable-stayed bridges and can be integrated into routine projects of bridge inspection.
引文
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[2] 吴向男,徐岳,梁鹏,等.桥梁结构损伤识别研究现状与展望[J].长安大学学报(自然科学版),2013,33(6):49-58.DOI:10.3969/j.issn.1671-8879.2013.06.008.Wu X N,Xu Y,Liang P,et al.Research status and prospect of bridge structure damage identification[J].Journal of Chang'an University(Natural Science Edition),2013,33(6):49-58.DOI:10.3969/j.issn.1671-8879.2013.06.008.(in Chinese)
[3] 齐怀展.基于模型修正的大跨斜拉桥损伤识别研究[D].天津:天津大学,2007.Qi H Z.Damage identification for long-span cable-stayed bridge based on modal updating[D].Tianjin:Tianjin University,2007.(in Chinese)
[4] Xiong W,Kong B,Tang P B,et al.Vibration-based identification for the presence of scouring of cable-stayed bridges[J].Journal of Aerospace Engineering,2018,31(2):04018007.DOI:10.1061/(asce)as.1943-5525.0000826.
[5] Jaishi B,Ren W X.Damage detection by finite element model updating using modal flexibility residual[J].Journal of Sound and Vibration,2006,290(1/2):369-387.DOI:10.1016/j.jsv.2005.04.006.
[6] 熊文,邹晨,叶见曙.基于动力特性识别的桥墩冲刷状态分析[J].中国公路学报,2017,30(5):89-96.DOI:10.3969/j.issn.1006-3897.2017.05.012.Xiong W,Zou C,Ye J S.Condition assessment of bridge scour by tracing dynamic performances of bridges[J].China Journal of Highway and Transport,2017,30(5):89-96.DOI:10.3969/j.issn.1006-3897.2017.05.012.(in Chinese)
[7] Wang X,Hu N,Fukunaga H,et al.Structural damage identification using static test data and changes in frequencies[J].Engineering Structures,2001,23(6):610-621.DOI:10.1016/s0141-0296(00)00086-9.
[8] 刘效尧,陈国祥.蚌埠和凤台斜拉桥设计与施工控制[J].中国公路学报,1992,5(3):66-71.DOI:10.19721/j.cnki.1001-7372.1992.03.012.Liu X Y,Chen G X.The design and construction control of Bengbu and Fengtai cable-stayed bridges[J].China Journal of Highway and Transport,1992,5(3):66-71.DOI:10.19721/j.cnki.1001-7372.1992.03.012.(in Chinese)
[9] 战家旺,夏禾,李泽新,等.考虑土体摩擦效应的公路桥墩动力特性分析方法[J].土木工程学报,2013,46(12):74-80.DOI:10.15951/j.tmgcxb.2013.12.007.Zhan J W,Xia H,Li Z X,et al.A method for dynamic characteristic analysis of roadway bridge piers considering soil friction effects[J].China Civil Engineering Journal,2013,46(12):74-80.DOI:10.15951/j.tmgcxb.2013.12.007.(in Chinese)
[10] 熊文,肖汝诚,叶见曙.超千米级CFRP与钢组合拉索斜拉桥动力性能分析[J].东南大学学报(自然科学版),2014,44(5):1011-1016.DOI:10.3969/j.issn.1001-0505.2014.05.024.Xiong W,Xiao R C,Ye J S.Dynamic performance analysis of over-1000 m-span cable-stayed bridges with CFRP-steel composite stay cables[J].Journal of Southeast University(Natural Science Edition),2014,44(5):1011-1016.DOI:10.3969/j.issn.1001-0505.2014.05.024.(in Chinese)